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Indeed. HPS==Red fall/autumn sun.
I'm vegging under one though, and it works fine.
Will be filling out with cool white CFL's though, but only because the room got bigger.

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faithlessxxx Reviewed by faithlessxxx on . 175w metal halide for entire grow? I am a first time grower (new card holder) and i have a 175 watt metal halide pendant lamp (actually 2 of them, but one has a bad ballast) from a previous saltwater reef tank that is now a fish only tank. My question is can I grow 3 or 4 plants with this one 175 pendant and can I use it throughout the entire cycle or do I really need a sodium vapor lamp? This will be the first of many, many questions I'm sure. Thanks! herbaltivo Rating: 5